Disambiguation Links – Ceratosaurus nasicornis (IDW-JPR)
The “horned lizard,” so named for the distinctive horn on its snout, was discovered in 1883 and the Cleveland Lloyd Dinosaur Quarry of Utah, and was described by Othniel C. Marsh in 1884. Ceratosaurus lived during the Late Jurassic period from about 153 to 148 million years ago; the type species, C. nasicornis, is known only from North America, but specimens of other species have been found in Portugal. The type specimen of the dinosaur measures about 5.3 m (17.5 ft) in length, though it is unclear if this animal was fully grown or not; a larger specimen discovered in Utah in the mid-1960s may have been up to 8.7 m (28.8 ft) long. Ceratosaurus had a proportionately large head for the size of its body and small, muscular arms, and osteoderms which ran down its body. In terms of taxonomy, Ceratosaurus belongs to the infraorder Ceratosauria and to the family Ceratosauridae, both of which are named after the animal.
Cloned in secret by InGen in 1999 under its new parent company Masrani Global, the Ceratosaurus is present only on Isla Sorna. The introduction of the species into the established Isla Sorna ecosystem caused considerable chaos, and threw Isla Sorna’s population into imbalance. This imbalance caused a population drop that coincided with a number of species returning to extinction. In 2001, a lone Ceratosaurus was seen by Alan Grant and the Kirbys on Isla Sorna. It is unclear why the animal was attracted to the area, but it quickly left after smelling the leavings of the Spinosaurus that Grant and the Kirbys had just extracted Paul‘s satellite phone from.
It was originally thought that the CGI model of the Ceratosaurus resembled that of the Tyrannosaurus, and as a result the Ceratosaurus was actually considered to be a mutant by the majority of the Jurassic Park fandom. It was classified as Ceratosaurus “mutatus” (x Tyrannosaurus); it was inferred that InGen may have filled in the gaps in the Ceratosaurus genome with tyrannosaur DNA. However, this was entirely speculative and is considered inaccurate now, as the Ceratosaurus from the Jurassic Park /// dinosaur charts show that this line of thought was wrong. We are therefore left to believe that it is, indeed, Ceratosaurus nasicornis that is present on Isla Sorna with no clear indications that it was a mutated species or not.